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This book constitutes the proceedings of the 12th International Conference on Spatial Information Theory, COSIT 2015, held in Santa Fee, NM, USA, in October 2015.

The 22 papers presented in this book were carefully reviewed and selected from 52 full paper submissions. The following topics are addressed: formalizing and modeling space-time, qualitative spatio-temporal reasoning and representation, language and space, signs, images, maps, and other representations of space, navigations by humans and machines.

Formalizing and Modeling Space-Time.- Qualitative Spatio-Temporal Reasoning and Representation.- Language and Space.- Signs, Images, Maps, and other Representations of Space.- Navigation by Humans and Machines.